Which of the following statements about nuclear energy is true?
a. nuclear energy cannot be contained nor controlled.
b. nuclear energy is contained in nuclear bonds.
c. nuclear energy is less efficient than other energy forms.
d. all of the above are true.

Henry, whose mass is 95 kg, stands on a bathroom scale in an elevator. the scale reads 830 n for the first 2.4 s after the elevator starts moving, then 930 n for the next 2.4 s. part a what is the elevator's speed 4.8 s after starting? express your answer with the appropriate units.